147512
Descrição
FlashCards por Konrad O'Neill, atualizado more than 1 year ago
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Criado por Konrad O'Neill
aproximadamente 11 anos atrás
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| Questão | Responda |
| This only occurs in chemical which contain only non-metals molecules have covalent bonding Molecules conain 2 or more non-metal atoms | A shared pair of electrons is a single covalent bond Each of the positively charged nuclei is attracted to the same negativeley charged pair of electrons |
| A:B Nucleus of A is attracted to the electron pair Nucleus of B is also attracted to the electron pair | The energy shells overlap so that the two atoms can share their electrons with the other |
| We show a covalent bond which is one shaired pair of electrons by | H-Cl H;Cl |
| Molecules of an element are also covalent. Covalent molecules usually only contain a few atoms. Most covalent substances have very small molecules. | The bonds in a covalent bond are very strong, but the forces between covalent molecules are very weak. These forces are called intermolecular forces or intermolecular attractions. Intermolecular forces arise from slight electrical distortions in molecules. |
| There are a few covalent substances that are giant. | Diamond and Graphite are 2 Giant covalent molecules in relation to Carbon |
| Diamond uses all four of its outer shell electrons to form 4 covalent bonds with 4 other Carbon atoms. Each form 4 more bonds and so it forms a giant molecule. This formation is called Tetrahedral. Diamond is very strong and has a hign mp, because to melt it you need to break thousands of covalent bonds |
Image:
diamond.GIF (image/GIF)
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| In Graphite each Carbon is only bonded to three other Carbon atoms. This leaves one electron in each Carbon atom. This extra electron leaves the Carbon atom and becomes delocalised between the layers of Carbon atoms. Graphite can conduct because it has delocalised mobile electrons. Graphite is soft and easily rubbed off because there are only weak forces between the layers of Carbon |
Image:
graphite (image/jpg)
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